At Work And At Play, How Cities Stack Up There is increasing awareness of cities as a defining trait of humanity and their importance to our health, economy and the environment. Here, some basic nuts and bolts about cities and the people who live, drive, work and play in them.

Cities Project

NPR's Series On Urban Life In The 21st Century

At Work And At Play, How Cities Stack Up

July 2, 20123:57 PM ET

There is increasing awareness of cities as a defining trait of humanity and their importance to our health, economy and the environment. Here, some basic nuts and bolts about cities and the people who live, drive, work and play in them.

Cities Project

NPR's Series On Urban Life In The 21st Century